Sapling addon - Is it possible to have controls for split levels over 4?
The levels property is defined around line 295 of 2.78/scripts/addons/add_curve_sapling/__init__.py

    levels = IntProperty(name='Levels',
        description='Number of recursive branches (Levels)',
        min=1,
        max=6,
        soft_max=4,
        default=3, update=update_tree)


As you can see only soft_max is defined as 4, meaning you can slide past, or because it's pretty heavy duty going beyond 4, just type in 5 or 6 and WAIT.